| visor | 1. A part of a helmet, arranged so as to lift or open, and so show the face. The openings for seeing and breathing are generally in it. 2. A mask used to disfigure or disguise. "My very visor began to assume life." "My weaker government since, makes you pull off the visor." (Sir P. Sidney) 3. The fore piece of a cap, projecting over, and protecting the eyes. Origin: OE. Visere, F. Visiere, fr. OF. Vis. See Visage, Vision Alternative forms: visar, visard, vizard, and vizor. Source: Websters Dictionary (01 Mar 1998) |
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| vista | Origin: It, sight, view, fr. Vedere, p. P. Visto, veduto, to see, fr. L. Videre, visum. See View, Vision. A view; especially, a view through or between intervening objects, as trees; a view or prospect through an avenue, or the like; hence, the trees or other objects that form the avenue. "The finished garden to the view Its vistas opens, and its alleys green." (Thomson) "In the groves of their academy, at the end of every vista, you see nothing but the gallows." (Burke) "The shattered tower which now forms a vista from his window." (Sir W. Scott) Source: Websters Dictionary (01 Mar 1998) |
| visual | Pertaining to vision or sight. Origin: L. Visualis, from videre = to see (18 Nov 1997) |
| visual acuity | <microscopy> The ability to detect fine details or small distances with the eye. Visual acuity can vary substantially depending on the definition used and method of measurement chosen. Under favourable conditions, the resolution of the human eye or ability to distinguish the twoness of adjoining lines, is about I minute of arc while the threshold delectability, or the detection of misaligned steps in a line (which is also a form of visual acuity), can be as low as a fraction of a second of arc. (05 Aug 1998) |
| visual agnosia | The inability to recognise objects by sight; usually caused by bilateral parieto-occipital lesions. Synonym: optic agnosia. (05 Mar 2000) |
| visual angle | The angle formed at the retina by the meeting of lines drawn from the periphery of the object seen. (05 Mar 2000) |
| visual aphasia | <neurology> Loss of the ability to understand printed words or sentences (27 Sep 1997) |
| visual area | Area of the occipital lobe concerned with vision. (12 Dec 1998) |
| visual axis | The straight line extending from the object seen, through the centre of the pupil, to the macula lutea of the retina. Synonym: line of vision. (05 Mar 2000) |
| visual blackout | See: amaurosis fugax. (05 Mar 2000) |
| visual cortex | Area of the occipital lobe concerned with vision. (12 Dec 1998) |
| visual cycle | The transformation of carotenoids involved in the bleaching and regeneration of the visual pigment. (05 Mar 2000) |
| visual efficiency | A rating used in computing compensation for industrial ocular injuries, incorporating measurements of central acuity, visual field, and ocular motility. (05 Mar 2000) |
| visual evoked potential | Voltage fluctuations that may be recorded from the occipital area of the scalp as the result of retinal stimulation by a light flashing at 1/4-second intervals; commonly summated and averaged by computer. (05 Mar 2000) |
| visual extinction | A condition in which individual stimuli are seen correctly, but when the nasal visual field of one eye and the temporal visual field of the fellow eye are stimulated simultaneously, one field is blind. Synonym: visual extinction. (05 Mar 2000) |
| visceroparietal |
(vis
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| visceroperitoneal |
(vis
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| visceropleural |
(vis
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| viscerosensory |
(vis
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| viscerosensory reflex |
a response or reaction to pressure on some part of the body due to disease of some internal organ.
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| vis | visit a place, as for entertainment |
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| vis | stay with as a guest |
| vis | someone who visits |
| vis | an official visit for inspection or supervision |
| vis | any disaster or catastrophe |
| vis | an annoying or frustrating or catastrophic event |
| vis | the right granted by a court to a parent (or other relative) who is deprived of custody of a child to visit the child on a regular basis |
| vis | the activity of making visits |
| vis | staying temporarily |
| vis | a written greeting that is left to indicate that you have visited |
| vis | an important or distinguished visitor |
| vis | a nurse who is paid to visit the sick in their homes |